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Re: Jacked Up Numbers

Originally posted by Earl K Hi RobG
You and I went through this a couple of forums ago. What TS numbers were/are wrong. I remember you reporting that JBL said to measure it yourself,,, etc. The numbers I use seem to give the appropriate curves for this class of speaker. Here's a pdf of a 2 cu' , 50 Hz tuning I did quite a while ago ( ignore the date stamp ) . How does this curve compare to what you see with your tuning-prediction software?

regards <. Earl K

Well for one thing...

Given a value for Fs of 35 Hz, Mms of 0.055 kilograms, and Sd of 0.090 square meters, Vas SHOULD be ~427.7 liters instead of 274.7.

E145 and 801C

Originally posted by Robh3606 I would love to get my hands on a pair of them to drop in my mains. My 801C is based on it and it is one really nice sounding driver.
Rob

ROB,
I have 2 E145 that need recone and I am wondering about getting them done.
Can you describe the frame of the 801C?
The E145 has a thicker frame about 3/4 " thick to allow for a deeper cone that usual JBL chassis. Is the 801C the same?

Do you have characteristic of the vents and volume of the box for the 801C.

The 801C uses the same frame as the E-145. The diference between the volumes would be the volume taken by the 2425S hanging off the back. Take a look at the attached photo. There is a recess in the UREI cabinet the frame is thicker than it looks in the photo. If you talk to JBL they told me to use the T/S for the E-145. I have always wondered about that though looking at the -3db for the 811C monitor. I think they have the box tunned tight for maximum transient response.